/* 
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

function validacion() {
    var isbn = document.getElementById("isbn");
    var miform = document.getElementById("miform");
    if (isbn.value === "") {
        alert("Datos ISBN No Validos!");
        return false;
    } else {
        miform.submit();
    }
}